Bits-back coding is a kind of entropy coding algorithm and can be used with an image generative model using latent variables for lossless image compression. It achieves excellent coding performance when ignoring the amount of initial bits which must be prepared independent of image contents. However, the initial bits are considered as additional information and indispensable for the encoding process. In this paper, a way of initial bits generation as well as discretization precision of the latent variables are investigated for better coding performance in a practical sense.
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